Glock G43 9mm 6-Round Magazine Bulk MF43106. Factory Glock magazines have a hardened steel insert encased in high tech polymer. This polymer coating protects the magazine and prevents deformation even when dropped from a great height.NOTE: GLOCK MAGAZINES CAN BE VERY DIFFICULT TO LOAD WHEN NEW. OFTEN THE LAST ROUND WILL NOT FIT UNTIL THE MAGAZINE HAS UNDERGONE A BREAK-IN PERIOD. IT IS RECOMMENDED THAT THE MAGAZINE BE LOADED WITH ALL BUT THE LAST ROUND AND LEFT FOR A FEW DAYS TO COMPRESS THE SPRING. CYCLING THE MAGAZINE FROM FULL TO EMPTY MULTIPLE TIMES CAN ASSIST IN THE BREAK-IN PERIOD. Specifications for Glock G27 .40 S&W 10 Round Pistol Magazine: Manufacturer: Glock Color: Black Package Contents: Glock G27 .40 S&W 10 Round Pistol Magazine What firearm models does the manufacturer say Glock G27 .40 S&W 10 Round Pistol Magazine is compatible with? The manufacturer says that Glock G27 .40 S&W 10 Round Pistol Magazine is compatible with Glock 36 Glock 29 Glock 30 Glock 33 Glock 35 Glock 22 .40 S&W Glock 35 .40 S&W Glock 23 Glock 31 Glock 38 Glock 43 Glock 37 Glock 27 .40 S&WGlock MF43106: G43 9mm 6-Round Magazine Bulk